JPS634987Y2 - - Google Patents
Info
- Publication number
- JPS634987Y2 JPS634987Y2 JP7761382U JP7761382U JPS634987Y2 JP S634987 Y2 JPS634987 Y2 JP S634987Y2 JP 7761382 U JP7761382 U JP 7761382U JP 7761382 U JP7761382 U JP 7761382U JP S634987 Y2 JPS634987 Y2 JP S634987Y2
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- magnetic strip
- rotating body
- magnetoresistive element
- sensitive magnetic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000005291 magnetic effect Effects 0.000 claims description 42
- 238000001514 detection method Methods 0.000 claims description 6
- 230000005415 magnetization Effects 0.000 claims description 3
- 230000004907 flux Effects 0.000 description 7
- 239000000696 magnetic material Substances 0.000 description 7
- 230000004043 responsiveness Effects 0.000 description 3
- 230000036760 body temperature Effects 0.000 description 2
- 229910017110 Fe—Cr—Co Inorganic materials 0.000 description 1
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000005408 paramagnetism Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
Description
【考案の詳細な説明】
本考案は非接触で回転体の温度を検出する装
置、特に回転体表面へ永久磁石および感温磁性体
を取付ける構造に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for detecting the temperature of a rotating body in a non-contact manner, and particularly to a structure for attaching a permanent magnet and a temperature-sensitive magnetic body to the surface of the rotating body.
従来、回転体の温度を非接触で検出するには、
例えば第１図に示すように回転体１１が強磁性体
である場合にはその表面に非磁性体層１を設け
て、その上に環状の永久磁石２及び環状の感温磁
性体３を設け、この感温磁性体３の周囲に間隔を
おいて磁気検出素子４（例えば磁気抵抗素子）を
対向させている。 Conventionally, to detect the temperature of a rotating body without contact,
For example, as shown in FIG. 1, when the rotating body 11 is a ferromagnetic material, a non-magnetic material layer 1 is provided on its surface, and an annular permanent magnet 2 and an annular temperature-sensitive magnetic material 3 are provided thereon. A magnetic detection element 4 (for example, a magnetoresistive element) is placed opposite the temperature-sensitive magnetic body 3 at a distance.
回転体の温度が低く感温磁性体３の温度がその
キユリー点未満の場合には、永久磁石２からの磁
束が感温磁性体３により遮蔽され、磁気抵抗素子
４には作用しないため、その抵抗は初期抵抗のま
まである。回転体の温度が上昇して感温磁性体３
の温度がキユリー点以上になると、感温磁性体３
の遮蔽作用が消滅するので、永久磁石２の磁束が
磁気抵抗素子４に作用し、その抵抗が増加する。
したがつて磁気抵抗素子４の抵抗値の変化を検知
することにより回転体の温度を検出できる。 When the temperature of the rotating body is low and the temperature of the temperature-sensitive magnetic material 3 is below its Curie point, the magnetic flux from the permanent magnet 2 is shielded by the temperature-sensitive magnetic material 3 and does not act on the magnetoresistive element 4. The resistance remains at the initial resistance. The temperature of the rotating body rises and the temperature-sensitive magnetic body 3
When the temperature of the temperature-sensitive magnetic material 3 exceeds the Curie point,
Since the shielding effect of is eliminated, the magnetic flux of the permanent magnet 2 acts on the magnetoresistive element 4, and its resistance increases.
Therefore, by detecting a change in the resistance value of the magnetoresistive element 4, the temperature of the rotating body can be detected.
しかしこの構造の場合には、感温磁性体３が永
久磁石２の上に装着されているので、回転体の熱
は永久磁石２を通つて感温磁性体３に作用するこ
とになり、熱応答性が悪いという問題がある。ま
た永久磁石２及び感温磁性体３は同心形状ではけ
ればならないため部分加工費が高いという欠点が
ある。 However, in this structure, since the temperature-sensitive magnetic body 3 is mounted on the permanent magnet 2, the heat of the rotating body acts on the temperature-sensitive magnetic body 3 through the permanent magnet 2. There is a problem with poor responsiveness. Furthermore, since the permanent magnet 2 and the temperature-sensitive magnetic body 3 must be concentrically shaped, there is a drawback that the cost of partial processing is high.
本考案は、上述した欠点を除去し、回転体への
永久磁石及び感温磁性体の取り付けが容易であ
り、熱応答性のよい回転体の温度検出装置を提供
することを目的とする。 SUMMARY OF THE INVENTION An object of the present invention is to provide a temperature detection device for a rotating body that eliminates the above-mentioned drawbacks, allows easy attachment of a permanent magnet and a temperature-sensitive magnetic body to a rotating body, and has good thermal responsiveness.
本考案は、検出温度に対応するキユリー点をも
つ可撓性の感温磁性帯板と、長手方向で等間隔に
磁化の向きを互いに逆向きにかつ幅方向に着磁さ
れた可撓性の永久磁石帯板とを、互いに重ねて貼
り合せてなる磁性帯体を、回転体の表面に感温磁
性帯板を内側にして長手方向を回転方向に一致さ
せて密着し、磁性帯板に近接して磁気抵抗素子を
配設したことを特徴とする。 The present invention consists of a flexible temperature-sensitive magnetic strip plate with a Curie point corresponding to the detected temperature, and a flexible temperature-sensitive magnetic strip plate whose magnetization direction is opposite to each other at equal intervals in the longitudinal direction and magnetized in the width direction. A magnetic strip made by laminating permanent magnet strips on top of each other is closely attached to the surface of a rotating body with the temperature-sensitive magnetic strip on the inside, with the longitudinal direction aligned with the rotation direction, and close to the magnetic strip. It is characterized by having a magnetoresistive element arranged therein.
以下、図面にしたがつて本考案を詳しく説明す
る。第２図は本考案の一実施例を示す。磁性帯体
５は第３図に示すように、所要のキユリー点の例
えばFe−Ni−Cr合金等から作られた可撓性をも
つ感温磁性帯板６と可撓性の永久磁石帯板（例え
ばゴム磁石、Fe−Cr−Co金属マグネツトなど）
７とを互いに重ね、ゴム系接着剤により貼り合せ
たものである。永久磁石帯板７は、幅方向に着磁
され、しかも長手方向で等間隔に磁化の向きが逆
向きであり、このような磁性帯体５を回転体（例
えば複写機の熱ロール）８の外周面に感温磁性帯
板６を内側にして密着状態にほぼ一回巻き付け
る。この磁性帯体５の円周面に近接して磁気抵抗
素子９が固定配置されている。 The present invention will be explained in detail below with reference to the drawings. FIG. 2 shows an embodiment of the present invention. As shown in FIG. 3, the magnetic strip 5 includes a flexible temperature-sensitive magnetic strip 6 made of, for example, Fe-Ni-Cr alloy, and a flexible permanent magnet strip at a desired Curie point. (e.g. rubber magnet, Fe-Cr-Co metal magnet, etc.)
7 are stacked on top of each other and bonded together using a rubber adhesive. The permanent magnet strip 7 is magnetized in the width direction, and the direction of magnetization is opposite at regular intervals in the longitudinal direction. The temperature-sensitive magnetic band plate 6 is wrapped around the outer peripheral surface almost once in a tight state with the temperature-sensitive magnetic band plate 6 on the inside. A magnetoresistive element 9 is fixedly arranged adjacent to the circumferential surface of the magnetic strip 5.
このような構成であるから磁気抵抗素子９と磁
性帯体５との代表的な対向状態には第４図に示す
ように３通りがある。 Because of this configuration, there are three typical opposing states between the magnetoresistive element 9 and the magnetic strip 5, as shown in FIG.
先づ回転体８の温度が低温で感温磁性帯板６の
温度がキユリー点未満の場合について磁気抵抗素
子９と磁性帯体５との対向状態別に説明する。第
４図ａのように磁気抵抗素子９が磁石帯板７の小
磁石７ａと対向している時には、小磁石７ａから
の磁束の大部分が感温磁性帯板６を通り、磁気抵
抗素子９に作用する磁束は僅かでその抵抗はR1
（第５図のａ点）である。また第４図ｂのように
磁気抵抗素子９が小磁石７ａと７ｂの境界と対向
していると、小磁石７ａと７ｂからの磁束は互い
に逆向きでほぼ等しいので、磁気抵抗素子９の抵
抗は基礎抵抗Roである。さらに第４図ｃのよう
に磁気抵抗素子９が小磁石７ｂと対向している時
には、小磁石７ａの場合と同じ大きさで向きが正
反対である磁束が作用するが、磁気抵抗素子９は
出力方向が単極性であるので、小磁石７ａの場合
と同じく抵抗R1（第５図のｃ点）である。したが
つて磁石帯板７の小磁石７ａ…７ｉ…が磁気抵抗
素子９の前を通過する毎に、磁気抵抗素子９に信
号ΔR1＝R1−Roが発生する。この信号をパルス
信号に変換しそのパルス間隔により回転体の回転
速度を知ることができる。 First, the case where the temperature of the rotating body 8 is low and the temperature of the temperature-sensitive magnetic strip 6 is less than the Curie point will be explained for each state in which the magnetoresistive element 9 and the magnetic strip 5 are opposed to each other. When the magnetoresistive element 9 faces the small magnet 7a of the magnet strip 7 as shown in FIG. 4a, most of the magnetic flux from the small magnet 7a passes through the temperature-sensitive magnetic strip 6, The magnetic flux acting on is small and its resistance is R 1
(Point a in Figure 5). Furthermore, when the magnetoresistive element 9 faces the boundary between the small magnets 7a and 7b as shown in FIG. is the basic resistance Ro. Furthermore, when the magnetoresistive element 9 is facing the small magnet 7b as shown in FIG. Since the direction is unipolar, the resistance R 1 (point c in FIG. 5) is the same as in the case of the small magnet 7a. Therefore , each time the small magnets 7a, . This signal is converted into a pulse signal, and the rotational speed of the rotating body can be determined from the pulse interval.
次に回転体が昇温して感温磁性帯板６の温度が
キユリー点以上の場合について同様に説明する。
第４図ａの状態では小磁石７ａからの磁束は常磁
性を呈する感温磁性帯板６側と磁気抵抗素子９側
とに同じように流れ、磁気抵抗素子９に作用する
磁束は低温の場合より増加し、その抵抗はR2（第
５図a′点）である、。また第４図ｃの状態の時に
も、既に説明したことから明らかなように、磁気
抵抗素子９の抵抗はR2（第５図c′点）である。そ
して第４図ｂのように磁気抵抗素子９と小磁石７
ａ，７ｂの境界と対向している時は、低温の場合
と同様に磁束が打ち消し合うので、磁気抵抗素子
９の抵抗は基礎抵抗Roである。したがつて磁石
帯板７の小磁石７ａ…７ｉ…が磁気抵抗素子９の
前を通過する度に磁気抵抗素子９が信号ΔR2＝
R2−Roを発生する。この信号ΔR1とΔR2の差に
よる出力電圧の差ΔV＝V2−V1（第６図）を検知
することにより回転体の温度を検出することがで
きる。また信号ΔR2の出現間隔から回転体の回転
速度を低温の場合と同様に知ることができる。 Next, the case where the temperature of the rotating body rises and the temperature of the temperature-sensitive magnetic strip 6 is equal to or higher than the Curie point will be similarly explained.
In the state shown in FIG. 4a, the magnetic flux from the small magnet 7a flows in the same way to the temperature-sensitive magnetic strip 6 side, which exhibits paramagnetism, and to the magnetoresistive element 9 side, and the magnetic flux acting on the magnetoresistive element 9 is at a low temperature. and its resistance is R 2 (point a' in Figure 5). Furthermore, even in the state shown in FIG. 4c, the resistance of the magnetoresistive element 9 is R2 (point c' in FIG. 5), as is clear from what has already been explained. Then, as shown in FIG. 4b, the magnetoresistive element 9 and the small magnet 7
When facing the boundary between a and 7b, the magnetic fluxes cancel each other out as in the case of low temperature, so the resistance of the magnetoresistive element 9 is the basic resistance Ro. Therefore, each time the small magnets 7a...7i... of the magnet strip 7 pass in front of the magnetoresistive element 9, the magnetoresistive element 9 generates a signal ΔR 2 =
Generates R 2 −Ro. The temperature of the rotating body can be detected by detecting the output voltage difference ΔV=V 2 −V 1 (FIG. 6) due to the difference between the signals ΔR 1 and ΔR 2 . Furthermore, the rotational speed of the rotating body can be determined from the appearance interval of the signal ΔR 2 in the same way as in the case of low temperature.
なお第６図において、ａは温度がキユリー点以
下の場合、ｂは温度がキユリー点以上の場合を示
す。 In FIG. 6, a indicates the case where the temperature is below the Curie point, and b indicates the case where the temperature is above the Curie point.
以上に述べてきたように、本考案によれば可撓
性のある永久磁石と感温磁性体とを貼り合せた磁
性帯体を用いるので、回転体への装着が極めて容
易で、回転体の熱が感温磁性帯体に直接伝達され
るので、応答性よく温度を検出できると共に回転
速度をも検出できる有用な温度検出装置が提供で
きる。 As described above, according to the present invention, since a magnetic strip made by bonding a flexible permanent magnet and a temperature-sensitive magnetic material is used, it is extremely easy to attach to a rotating body, and Since heat is directly transferred to the temperature-sensitive magnetic strip, it is possible to provide a useful temperature detection device that can detect temperature with high responsiveness and also detect rotation speed.
第１図は従来の回転体温度検出装置の一例の構
成図、第２図は本考案による回転体の温度検出装
置の一実施例の斜視図、第３図は本考案に用いら
れる磁性帯体の一部のみの斜視図、第４図は本考
案の作用を説明する要部斜視図、第５図は磁気抵
抗素子の特性と出力信号の説明図、第６図は出力
電圧パルスの説明図である。
１……回転体非磁性外層、２……永久磁石、３
……感温磁性体、４，９……磁気抵抗素子、５…
…磁性帯体、６……可撓性感温磁性帯板、７……
可撓性永久磁石帯板、８……回転体。
Fig. 1 is a configuration diagram of an example of a conventional rotating body temperature detection device, Fig. 2 is a perspective view of an embodiment of a rotating body temperature detection device according to the present invention, and Fig. 3 is a magnetic strip used in the present invention. FIG. 4 is a perspective view of the main part explaining the operation of the present invention, FIG. 5 is an illustration of the characteristics of the magnetoresistive element and the output signal, and FIG. 6 is an illustration of the output voltage pulse. It is. 1... Rotating body non-magnetic outer layer, 2... Permanent magnet, 3
... Temperature-sensitive magnetic material, 4, 9 ... Magnetoresistive element, 5...
...Magnetic strip, 6... Flexible temperature-sensitive magnetic strip, 7...
Flexible permanent magnet strip, 8...Rotating body.
Claims (1)
撓性の感温磁性帯板と、長手方向で等間隔に磁化
の向きを互いに逆向きにかつ幅方向に着磁された
可撓性永久磁石帯板とを、互いに重ねて貼り合わ
せてなる磁性帯板を、回転体の表面に上記感温磁
性帯板を内側にして長手方向を回転方向に合せて
密着し、上記磁性帯板に近接して磁気抵抗素子を
配設したことを特徴とする回転体の温度検出装
置。 A flexible temperature-sensitive magnetic strip with a Curie point corresponding to the temperature to be detected, and a flexible permanent magnet strip whose magnetization direction is opposite to each other at equal intervals in the longitudinal direction and magnetized in the width direction. A magnetic strip plate formed by stacking and pasting together two plates is closely attached to the surface of a rotating body with the temperature-sensitive magnetic strip plate inside and the longitudinal direction aligned with the direction of rotation, and the magnetic strip plate is placed close to the magnetic strip plate. A temperature detection device for a rotating body, characterized in that a magnetoresistive element is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7761382U JPS58180438U (en) | 1982-05-28 | 1982-05-28 | Temperature detection device for rotating body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7761382U JPS58180438U (en) | 1982-05-28 | 1982-05-28 | Temperature detection device for rotating body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58180438U JPS58180438U (en) | 1983-12-02 |
| JPS634987Y2 true JPS634987Y2 (en) | 1988-02-10 |
Family
ID=30086863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7761382U Granted JPS58180438U (en) | 1982-05-28 | 1982-05-28 | Temperature detection device for rotating body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58180438U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7329425B2 (en) * | 2019-11-29 | 2023-08-18 | Nok株式会社 | Discs for rotary encoders, sealing devices and speed measuring devices |
-
1982
- 1982-05-28 JP JP7761382U patent/JPS58180438U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58180438U (en) | 1983-12-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS6349724Y2 (en) | ||
| EP0221540A3 (en) | Magnetic transducer head utilizing magnetoresistance effect | |
| JPS618670A (en) | Device for detecting speed of revolution and/or angle of rotation of shaft | |
| JPS63117309A (en) | Magnetic reluctivity reader/converter | |
| JPH01208715A (en) | Magnetoresistance head sensor | |
| JPS634987Y2 (en) | ||
| JPS6229005B2 (en) | ||
| JPS6243483B2 (en) | ||
| GB2107067A (en) | Magnetic position detector for rotary element | |
| KR960706064A (en) | MAGNETIC SIGNAL DETECTION APPARATUS | |
| JPS60104740U (en) | temperature detection device | |
| JPS5637507A (en) | Revolution sensor | |
| JPS5616801A (en) | Magnetic scale | |
| JPH0285379U (en) | ||
| JP2513851Y2 (en) | Rotation sensor | |
| JPH0129800Y2 (en) | ||
| JPS58180437U (en) | Temperature detection device for rotating body | |
| JPS61290377A (en) | Magnetoresistance effect type sensor | |
| JP2707850B2 (en) | Magnetoresistive element | |
| JPH0833308B2 (en) | Magnetic sensor and manufacturing method thereof | |
| JPS63118627A (en) | Torque sensor | |
| JPS62263480A (en) | Magneto resistance effect type magnetic sensor | |
| JPH0711429B2 (en) | Encoder device | |
| JPH08201015A (en) | Angle of rotation detector | |
| JPS6292405U (en) |